Locomotive boiler



(No Model.) 2 Sheets-Sheet 1. C. 0. HEGGEM. LOGUMOTIVE BOILER.

Patented Nov. 10, 1896.

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(No M0161.) l 2 sheets-sheen 2. C. O. HEGGEM. LOGOMOTIVB BOILER.-

No. 571,118. 12119111611 Nov. 10, 1896.l

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as co.. moro-urne.. wnsnmmo UNITED STATES PATENT OFFICE.,

CHARLES O. HEGGEM, OF MASSILLON, OHIO, ASSIGNOR TO THE RUSSELL df,

COMPANY, OF SAME PLACE.

LOCOMOTlVE-BOlLER.

SPECIFICATION forming part of Letters Patent No. 571,118, dated November 10, 1896.

Application iiled July 9, 1896. Serial No. 598,528. (No model.)

To @ZZ whom it may concern.-

Be it known that I, CHARLES O. HEGGEM, a citizen of the United States, residing at Mas- A sillon, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Locomotive Boilers, of which the following is a specification, reference being had therein to the accompanying drawings. ro This invention has reference particularly to locomotive-boilers; and the object of the invention is the construction of a boiler that will be capable of burning alternately either straw or solid fuel, as may be desired, and which shall be provided with a draft apparatus that may be made applicable in each case for the particular fuel burned, producing always a perfect combustion.

lVith this object in view the invention conzo sists in the novel combination and arrangement of the various boilerparts, which will be more fully hereinafter described, and shown in the drawings, in which- Figure 1 is a vertical central section through my improved boiler, illustrating the arrangement of dampers when using straw as a fuel. Fig. 2 is a similar section through the combustion-chamber and nre-box, illustrating the arrangement of dampers and the direction of 3o the draft when solid fuel is used. Fig. 3 is an end view of the boiler, showing a half rear elevation and a half-section through fire-box. Fig. 4 is a front elevation of the boiler, showing the construction and location of the front 3 5 Vdamper and showing a section through smokeboX.

The letter A designates the outer casing of the boiler, extending beyond the fiues and provided with a smoke-stack A at its for- 4o ward end and having a downward extension B at its rear. At the smoke-stack end the boiler is provided with an inner shell C, secured at one end tothe flange B' upon the fluesheet D, at the top to a collar C', attached to the casing below the stack, and at the other to the outer casing. This shell, which constitutes the smoke-box of the boiler, is of .smaller diameter than the outer casing, thus forming anannular space between the two 5o for the circulation of water and steam around the box, and is provided with an enlargement D at its forward end where it is fitted against and secured to the inner wall of the casing. E is a suitable door adapted to close the entire area of the forward end of said casing. It will be seen by this construction that by jacketing the boX as described the same will be protected against excessive heat of the boiler, thus increasing the length of life of the smoke-box extension, preventing 6o to a great degree the corrosion of this part of the boiler, which is ordinarily so great as to reduce its thickness to an egg-shell in the course of a very few years. At the same time an increased amount of heating-surface is provided.

At the rear of the smoke-box O are arranged the usual lines E, secured at their forward ends in the shell O and at their rear in the flue-sheet F. This latter sheet, at the top, is 7o attached in any suitable manner to the crownsheet H, secured to the outer shell by stayrods I, and at the bottom to a baffle-wallA J, which extends across the rear of the boiler from side to side, forming the combustionchamber J' above and the lire-box J 2 below the saine.

The baffle-wall is composed of two metallic sheets or plates G and G, secured to each other at some distance apart by tie-bolts a. 8o The upper sheet of the wall is secured at the front to the line-sheet E and at the rear to the outer casing, while'the lower plate is attached at its rear to the casing and at its forward end to an upright sheet K, the latter sheet being secured at some distance apart, by'means of tie-bolts b, to the downward eX- tension B of the outer casing. L are vertical tubes arranged in the baffie-wall, which y form passages through the same for the heat 9o and products of combustion from the iire.

M and N, Fig. 2, are door-controlled passages leading, respectively, into the combustion and re chambers. By this construction a water-space is formed in the baffle-wall and 9 5 a water-leg is provided at the front of the fire-box, both of which are adapted to communicate with the water in the interior of the boiler. l

Below the baffle-wall are located the usual roo grates O, and beneath the grates the ash-pit P. Theash-pit, at the front and rear, is

provided with damper-controlled draft openings or passages, and beneath the pit with a water-space P', formed between the outer casing of the boiler and the metallic sheets Q, attached to the casing by the usualvtie-bolts. This water-space is adapted to communicate with the water in the interior of the `boiler through the usual water-legs Q, arranged' upon each side of the combustion-chamber and fire-box.

The draft-openingR at the rear of the boiler forms, besides a draft, a discharge passage for the ashes from the fire-box.

S is a damper hin-ged above and adapted to control the draft-passage R. Forwardly of this passage is arranged a second draftopening T, extending partly across the front of the downwardly-extending portion of the boiler, and isprovided with a damper U, similarly constructed and arranged to the damper S.

Vhen solid fuel is to be used, the arrangement of the drafts is illustrated in Fig. 2, which view shows the damper at the rear of the boiler, below the passage into the firebox, open, while the draft-passage T in the front of the boiler is closed. This causes the draftto iiow in the direction of the arrows, said draft being applied from underneath the grates causing the coal to burn evenly. The purpose of the door leading to the combustion-chamber is to give accessibility to the same, and also to furnish a certain amount of air through the wicker of the door. The oxygen in the air supplied through this opening being heated to the point of ignition keeps funnel, the free end being adapted to rest continually against the straw as it is forced into the fire-box. The damper U is now raised, thereby opening the draft-passage T, and the ldraft-opening R at the rear of the boiler is closed. This causes the draft to flow in a direction as shown in Fig. l, causing the straw to burn at the ends as it is forced in through the funnel.

By constructing and arranging the drafts in the manner described all the straw will be burned and a perfect combustion obtained, which heretofore has not been accomplished, as by the old method of applying the draft from underneath, in the manner illustrated in Fig. 2, when coal is the fuel used, if a considerable quantity of straw were forced in, the fire would be put out.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

In a locomotive-boiler for alternately burning straw and solid fuel, the following instrumentalities; an outer casing, an inner shell constituting the sides and top, the front, rear and bottom of the furnace, an inclined baffle-wall forming a partition in said inner shell, and having passages, a combustioncharnber above the baffie-wall with a dooropening, a fire-box proper beneath the said wall with a door-opening, grate-bars extending from the front to the rear wall of said inner shell, an ash-pit constituting also a draftpassage beneath the grate-bars, a door-controlled draft-passage in the front wall leading through the ash-pit to that end of the grate-bars, and a door-controlled draft-passage in the rear wall leading through said ash-pit to that end of said grate-bars, whereby in burning straw air is introduced through the forward passage lwhile the latter is closed, and in burning coal the latter is opened while the former is closed.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES O. HEGG'EM.

fitnessesz XV. K. ATWATER, IRVINE A. Yosr. 

